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Azolla filiculoides root cross section Azolla covering the Canning River, Western Australia Azolla is a highly productive plant . It can double its biomass in as little as 1.9 days, [ 13 ] depending on growing conditions, and yield can reach 8–10 tonnes fresh matter/ha in Asian rice fields. 37.8 t fresh weight/ha (2.78 t/ha dry weight) has ...
Salviniales are all aquatic and differ from all other ferns in being heterosporous, meaning that they produce two different types of spore (megaspores and microspores) that develop into two different types of gametophyte (female and male gametophytes, respectively), and in that their gametophytes are endosporic, meaning that they never grow outside the spore wall and cannot become larger than ...
Salvinia is related to the other water ferns, including the mosquito fern Azolla. Recent sources include both Azolla and Salvinia in Salviniaceae, although each genus was formerly given its own family. Salvinia, like the other ferns in order Salviniales, are heterosporous, producing spores of differing sizes.
Azolla nilotica is a floating water-bound fern of up to 32 cm (13 in) long, ... Azolla species have two types of spores (a state called heterosporous), ...
Salviniaceae (/ s æ l ˌ v ɪ n i ˈ eɪ s i ˌ iː /), [1] [2] is a family of heterosporous ferns in the order Salviniales. [3] The Salviniaceae contain the two genera Azolla and Salvinia, [4] with about 20 known species in total. [5] The oldest records of the family date to the Late Cretaceous. [6]
Azolla filiculoides (water fern) is a species of aquatic fern. It is native to warm temperate and tropical regions of the Americas , and has been introduced to Europe , North and sub-Saharan Africa , China , Japan , New Zealand , Australia , the Caribbean and Hawaii .
Heterospory evolved due to natural selection that favoured an increase in propagule size compared with the smaller spores of homosporous plants. [2] Heterosporous plants, similar to anisosporic plants [clarification needed], produce two different sized spores in separate sporangia that develop into separate male and female gametophytes.
Azolla cristata , the Carolina mosquitofern, [3] Carolina azolla or water velvet, is a species of Azolla native to the Americas, in eastern North America from southern Ontario southward, and from the east coast west to Wisconsin and Texas, and in the Caribbean, and in Central and South America from southeastern Mexico south to northern Argentina and Uruguay.